And thus, Microsoft bites itself in its behind with Metro. As you all surely know by now, the Metro environment in Windows 8, and its accompanying applications, need to follow a relatively strict set of rules and regulations, much like, say, applications on iOS. For one type of application, Metro has already proven to be too restrictive and limited: web browsers. Microsoft has had to define a separate application class [.docx] - aside from Metro and desktop applications - just to make third party web browsers possible for Windows 8.

... parts of public utilities, infrastructure; where it's just natural, efficient, lowers costs; and in return for servicing virtually whole of the population, also unprofitable parts, with stable prices.
Or spectrum, in a way - otherwise it would probably end up in mafia-like web of extortions and/or who can build the more powerful transmitters (or, really, jammers - so going back to extortions). Maybe also financial exchanges.
Or in general, network effects can be and are beneficial, especially where the infrastructure involved is very costly.

Properly regulated of course - EU fines are part of the process, that's this "separate thing" that I mentioned.

(yeah, sure, I sorta can do business with another power company and such ...but, really, this is just procedural cloak, hiding the nature of the situation, as part of those regulatory activities)